PSV have already announced that Lammers is available on loan this summer with Eindhoven Dagblad reporting on Friday that seven clubs are interested.

One of those clubs is Heerenveen, but the Frisians are only interested in a permanent deal while PSV are only interested in a loan. Negotiations between the two club have not yet come to an agreement.

The 21-year-old failed to net in seven Eredivisie appearances last season but scored 11 goals in 16 appearances for Jong PSV in the Jupiler League. He has also held talks with VVV Venlo, but would prefer a move to Heerenveen.